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Nine imipenem-resistant Pseudomonas aeruginosa isolates were found to contain a variety of metallo-beta-lactamase genes, including bla(IMP-1), bla(IMP-7), bla(VIM-2), bla(VIM-6), and the novel bla(IMP-26). Multilocus sequence typing showed a diversity of sequence types. Comparison with isolates from an earlier study showed that the epidemic clones from 2000 have not become established.
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Koh et al. (2010) studied this question.
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